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shivanshi asthana Grade: 11
        

plz explain the concept of pseudo unimolecular reactions......thanks..

7 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear student,


Measuring a second order reaction rate with reactants A and B can be problematic: the concentrations of the two reactants must be followed simultaneously, which is more difficult; or measure one of them and calculate the other as a difference, which is less precise. A common solution for that problem is the pseudo first order approximation


If either [A] or [B] remain constant as the reaction proceeds, then the reaction can be considered pseudo first order because in fact it only depends on the concentration of one reactant. If for example [B] remains constant then:


\ r = k[A][B] = k'[A]


where k' = k[B]0 (k' or kobs with units s−1).


 









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Sagar Singh


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6 years ago
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